This instrumentation circuit was found in the September 1989 Radio Electronics magazine. The circuit uses an analog indicator and the power supply must be symmetrical.
This circuit is from a 1978 publication. It can be assembled with BC548 transistors for NPN and...
Wired to the output of any amplifier this circuit makes an incandescent lamp flash according the...
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...